I think it was Kerbdog's first album "On the Turn". I can remember vividly buying my first cd player with my brother as he had just got a job and was loaded, so he spent his first £30 wage packet on a portable cd player!
The first CD he bought I believe was Silverchair's "Freakshow"
I remember my first cassette tape I actually bought myself was Entombed's "DCLXVI: To Ride Shoot Straight and Speak the Truth". I played the absolute crap out of that thing. I blew the speakers up on my parents cassette player the very first time I played it too. That wasnt much before we bought the cd player, so I bought the cd not long after too but the tape got played in the parents car and in my walkman daily.